That was more than the £54 Liverpool supporters were charged earlier in the competition - and United today responded by announcing they would subsidise their fans by £35 each for their seats.

To pay for that gesture, United also decided to increase ticket prices for Sevilla fans by £35 each in an effort to protest at what they see is unfair exploitation of their fans.

Any extra money made by the increase in prices will go straight to the Manchester United Foundation.

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Sevilla have increased prices for home and away fans for the Manchester United matchCredit: Getty - Contributor

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United have hiked prices for Sevilla fans for the return leg at Old TraffordCredit: Reuters

But Sevilla have reacted angrily to United's move, and instead of agreeing to reduce prices for travelling fans from England they have now said they will subsidise costs for their own supporters going to Old Trafford for the second leg.

And in an escalation of the conflict, they have now threatened to report United to Uefa claiming they break the competition's ticketing regulations.